Fruit crate weight

The fruit crate is seven times heavier than an empty crate. A full crate weighs 30 kg more than an empty one. How many kg does an empty crate weigh?

Final Answer:

x =  5 kg

Step-by-step explanation:

x+y = 7x
x+y = 30+x

x+y = 7·x
x+y = 30+x

6x-y = 0
y = 30


y = 30/1 = 30
x = 0+y/6 = 0+30/6 = 5

x = 5
y = 30

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